Size-dependent change in thedbands of Cu particles

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Abstract
In the photon-energy region 1.5–6.5 eV, a size-dependent change in interband transitions associated with the d bands of metal particles has been detected directly for the first time by measuring the transmittance spectrum and its derivative of Cu island films. It is shown that the narrowed d bands for Cu particles smaller than 70 Å in diameter depart from flatness gradually from the highest to the lowest levels with decreasing particle size. Comparing the d bands of bulk Au surface, this d-band change is shown to be connected with the reduced coordination number of atoms on the particle surface.